Castiel: When Jack was dying, I... I made a deal, to save him.
Dean Winchester: You.. what?
Castiel: Th-The price was my life. When I experienced a moment of true happiness, the Empty would be summoned and... it would take me forever.
Dean Winchester: Why are you telling me this now?
Castiel: I always wondered ever since I took that burden, that curse, I wondered what it could be - what-what my true happiness could even look like. I never found an answer because the one thing I want... it's something I know I can't have. But I think I know- I think I know now. Happiness isn't in the having, it's in just being. It's in just saying it.
Dean Winchester: What are you talking about, man?
Castiel: I know. I know how you see yourself, Dean. You see yourself the same way our enemies see you. You're destructive and you're angry and you're broken. You're... daddy's blunt instrument. And you think that hate and anger, that's... what drives you, that's what you are. It's not. Anf everyone who knows you sees it. Everything you have ever done, the good and the bad, you have done for love. You raised your little brother for love, you fought for this whole world, for love. That is who you are. You're the most caring man on earth, you are the most selfless... Loving human being I will ever know. You know ever since we met, and ever since I pulled you out of hell, knowing you has changed me. Because you cared, I cared. I care about you, I cared about Sam and about Jack but I cared about the whole world because of you. You changed me, Dean.
Dean Winchester: Why does this sound like a goodbye?
Castiel: Because it is... . I love you.
Dean Winchester: Don't do this Cas... . Cas
Castiel: Goodbye, Dean
